The intrepid crew at iFixit tackled something a little tougher than the iPad 2 Smart Cover, masterfully dissecting Nikon's new D5100 DSLR. And it proved to be just the challenge they were looking for—screws, screws, and more screws.

Perhaps their estimate of "billions" is off by a decimal point or two, but the thing is not for the screwdriver faint of heart. In fact, the D5100 is so screw-happy that the teardown manual had to skip a lot of the unscrewing instructions, lest we all go insane reading it. But there are some exciting bits in there! iFixit found that the "sensor has a special glass cover that turns red when viewed at an angle, but is completely transparent when viewed head-on," and warned that the flash's capacitor needs to be discharged, unless you want to blow out your camera (and give yourself a bad zap). [iFixit]